What to do with my bag when going on rides at Disneyworld?

they usually have you put your stuff in these i think before you ride, a backpack since its bigger would be less likely to be stolen. but a purse you can just sit on when you go on rides so you dont have to worry about someone stealing it, and it wont fall of the ride either. you should bring a purse so you can sit on it, dont forgot it when you leave though